<template>
    <div>数字:{{ num }}</div>
    <button @click="add">+1</button>
     <button @click="dec">-1</button>
</template>

<script setup>
import { ref } from "vue";
    let num=ref(1);
    function add(){
    num.value++;
    }
    function dec(){
    num.value--;
    }
</script>

<style>
</style>